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parisc-kernel-perf: BKL pushdown

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
2008-05-20 19:16:31 +02:00
committed by Jonathan Corbet
parent 6044c319d1
commit b691750098
1 changed files with 4 additions and 0 deletions
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4
arch/parisc/kernel/perf.c
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@@ -46,6 +46,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/proc_fs.h> #include <linux/proc_fs.h>
#include <linux/miscdevice.h> #include <linux/miscdevice.h>
#include <linux/smp_lock.h>
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
@@ -260,13 +261,16 @@ printk("Preparing to start counters\n");
*/ */
static int perf_open(struct inode *inode, struct file *file) static int perf_open(struct inode *inode, struct file *file)
{ {
lock_kernel();
spin_lock(&perf_lock); spin_lock(&perf_lock);
if (perf_enabled) { if (perf_enabled) {
spin_unlock(&perf_lock); spin_unlock(&perf_lock);
unlock_kernel();
return -EBUSY; return -EBUSY;
} }
perf_enabled = 1; perf_enabled = 1;
spin_unlock(&perf_lock); spin_unlock(&perf_lock);
unlock_kernel();
return 0; return 0;
} }